|Engine||349 cc, OHV air cooled single|
|Top speed||91 mph|
|Power||28 bhp @ 7,000 rpm|
|Wheelbase||53.25 inches (135.3 cm)|
|Weight||364 pounds (165 kg) (dry)
|Fuel capacity||3.5 gallons|
|Turning radius||16 feet (4.9 m)|
The Velocette Viper is a British motorcycle made by Velocette between 1955 and 1968. Built using traditional methods and materials, it struggled to compete against more modern machines, so from 1960 the designers added new glass fibre enclosure panels, making the Viper one of the first enclosed production motorcycles.
Introduced in October 1955, the single-cylinder Viper was developed from the 349cc Velocette MAC. Designed by Charles Udall, the Viper's 349cc engine had a bi-metal cylinder with a cast iron liner, high compression piston and a light alloy cylinder head. Using the same bottom end as its sister bike the 500cc Velocette Venom, the Viper had a lot of chrome plating and was offered in a choice of black or "willow green" paintwork. The Viper was also ahead of its time in being one of the first to have glass fibre enclosure panels from 1962. These panels proved unpopular with the traditional buyers of Velocette singles, as they extended from the front of the engine, level with the top of the crankcase, to the rear pillion footrests.
From 1960 Velocette produced the Viper in a "Clubman" racing version, fitted with TT Amal carburettors, a BTH racing magneto and a close ratio gearbox, with the compression ratio raised to 9.3 to 1. The Clubman dispensed with the unpopular glass fibre enclosure and instead made a feature of its highly polished crankcase and gearbox castings. Supplied with "rearset" controls, lowered handlebars and a steering damper, the Clubman also had a range of optional accessories including a "megaphone" exhaust silencer, a rev counter and light alloy wheel rims.
In December 1958 the Velocette development team built 25 off-road Vipers, which were sent to the United States for evaluation in enduro events. Built to the Viper Clubman standard, the Scrambler had a specially lightened frame and high level enduro style exhaust pipes.
The Velocette Viper Special was introduced in November 1962 and featured a three gallon tank, pressed steel full width hub and the Velocette MSS rear hub as well as a '100 mph' speedometer in a modified headlamp nacelle.
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- Currie, Bob (1980). Great British Motorcycles of the Fifties. Hamlyn Publishing Group Ltd. ISBN 0-86363-010-3.
- Bacon, Roy (1988). British Motorcycles of the 60's. Osprey Publishing. ISBN 1-85648-166-2.
- Gibbison, David. "Velocette Evolution". Retrieved 2009-05-30.
- "Velocette Viper Scrambler". Retrieved 2009-05-30.